P.S. I think the word ZERO is the main issue. it's interesting to attempt to use zero UI, but in reality, not many games other than the ones that rely on pure experimentation can meet that standard. maybe a 'NO TRADITIONAL UI elements' theme would have been an equally interesting and challenging constraint - without leaving us all in the dark (so to speak 🕯). we might have still been unsure about the term 'traditional', but it wouldn't have seemed like a virtually impossible challenge.